Make your life a little easier and add a related_name argument to your
Roll_No foreign key.
Example:
Roll_No = models.ForeignKey('Student_Info',to_field='Roll_No',
related_name = 'students')
Then:
obj.students.all()[0].E_mail
Without a related name:
obj.student_set.all()[0].E_mail
Note:
If it's a one-to-one relationship then you should use a OneToOne
instead of a ForeignKey. That will allow something like this:
obj.studient.E_mail
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